<template>
    <div class="sidebar">
        <el-menu class="sidebar-el-menu"
                 :default-active="onRoutes"
                 :collapse="collapse"
                 collapse-transition
                 background-color="#334256"
                 text-color="#ffffff"
                 active-text-color="#20a0ff"
                 router>
            <template v-for="item in items">
                <template>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        {{item.title}}
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
    import bus from '../assets/js/bus'

    export default {
        data() {
            return {
                collapse: false, //折叠
                items: [
                    {
                        icon: 'el-icon-document',
                        index: '/Info',
                        title: '系统首页'
                    },
                    {
                        icon: 'el-icon-document',
                        index: '/Consumer',
                        title: '用户管理'
                    },
                    {
                        icon: 'el-icon-document',
                        index: '/Singer',
                        title: '歌手管理'
                    },
                    {
                        icon: 'el-icon-document',
                        index: '/SongList',
                        title: '歌单管理'
                    }
                ]
            }
        },
        computed: {
            onRoutes() {
                return '/' + this.$route.path.replace('/', '')
                //return '/Info'
            }
        },
        created() {
            //通过bus继续组件间的通信,来折叠侧边栏
            //on接受消息
            bus.$on('collapse', msg => {
                console.log('收到消息')
                this.collapse = msg
            })
        }
    }
</script>

<style scoped>
    .sidebar {
        background-color: #334256;
        display: block;
        position: absolute;
        left: 0;
        top: 70px;
        bottom: 0;
        overflow-y: scroll;
    }
    .sidebar::-webkit-scrollbar {
        width: 0;
    }
    .sidebar-el-menu:not(.el-menu--collapse) {
        /*width: 150px;*/
    }
    .sidebar>ul{
        height: 100%;
    }


</style>